Percentage Calculator
Three everyday percentage calculations in one place.
Quick answer
Percentage = (part ÷ whole) × 100. For example, 45 out of 60 is 75%. To find X% of a number, multiply the number by X and divide by 100: 15% of 80 is 12. Percentage change = (new − old) ÷ old × 100, so going from 50 to 65 is a 30% increase.
What is X% of Y?
600
X is what % of Y? (marks)
77.82%
% increase / decrease
+15%
Common percentages of 100, 250 and 1,000
| Percent | Of 100 | Of 250 | Of 1,000 |
|---|---|---|---|
| 5% | 5 | 12.5 | 50 |
| 10% | 10 | 25 | 100 |
| 15% | 15 | 37.5 | 150 |
| 20% | 20 | 50 | 200 |
| 25% | 25 | 62.5 | 250 |
| 30% | 30 | 75 | 300 |
| 50% | 50 | 125 | 500 |
| 75% | 75 | 187.5 | 750 |
How it works
Use the first calculator for discounts, tips and shares — 20% off $80 is $16, so you pay $64. Use the second to turn a score into a percentage: 45 out of 60 is 75%, and 856 out of 1,100 is 77.82%. Use the third to see how much something changed — a salary going from 50,000 to 57,500 is a 15% increase.
A common mistake is reversing a percentage change. A 20% drop followed by a 20% rise does not bring you back to the start: 100 falls to 80, and 20% of 80 is only 16, giving 96. To undo a 20% drop you need a 25% rise.
Frequently asked questions
How do I calculate a percentage of marks or a grade?
Divide the marks you got by the total marks and multiply by 100. For example, 45 ÷ 60 × 100 = 75%.
How is percentage increase calculated?
Subtract the old value from the new value, divide by the old value, and multiply by 100.
How do I work out a discount?
Multiply the price by the discount percentage and divide by 100 to get the saving, then subtract it from the price. 30% off $60 saves $18, so you pay $42.